Polish-French chemist and physicist whose celebrated experiments (1898) on uranium minerals led to discovery of two new elements: polonium and radium. With Henri Becquerel and her husband, Pierre Curie, she was awarded the 1903 Nobel Prize for Physics. She was then sole winner of a second Nobel Prize in 1911, this time in Chemistry.

After all, science is essentially international, and it is only through lack of the historical sense that national qualities have been attributed to it.

— Marie Curie

'Memorandum by Madame Curie, Member of the Committee, on the Question of International Scholarships for the advancement of the Sciences and the Development of Laboratories', League of Nations, International Committee on Intellectual Co-operation: Sub-committee of Experts for the Instruction of Children and Youth in the Existence and Aims of the League of Nations. (Recommendations. Preamble): Issue 5, Issues 9-13 (1926), 12.

Humanity certainly needs practical men, who get the most out of their work, and, without forgetting the general good, safeguard their own interests. But humanity also needs dreamers, for whom the disinterested development of an enterprise is so captivating that it becomes impossible for them to devote their care to their own material profit. Without the slightest doubt, these dreamers do not deserve wealth, because they do not desire it. Even so, a well-organised society should assure to such workers the efficient means of accomplishing their task, in a life freed from material care and freely consecrated to research.

I am among those who think that science has great beauty. A scientist in his laboratory is not only a technician: he is also a child placed before natural phenomena which impress him like a fairy tale. We should not allow it to be believed that all scientific progress can be reduced to mechanisms, machines, gearings, even though such machinery has its own beauty.

I have no dress except the one I wear every day. If you are going to be kind enough to give me one, please let it be practical and dark so that I can put it on afterwards to go to the laboratory.[Referring to her wedding dress.]

I shall devote only a few lines to the expression of my belief in the importance of science ... it is by this daily striving after knowledge that man has raised himself to the unique position he occupies on earth, and that his power and well-being have continually increased.

It would be impossible, it would be against the scientific spirit. … Physicists should always publish their researches completely. If our discovery has a commercial future that is a circumstance from which we should not profit. If radium is to be used in the treatment of disease, it is impossible for us to take advantage of that.

— Marie Curie

In a discussion with her husband, Pierre, about the patenting of radium, in Marie Curie by Eve Curie (1939).

Life is not easy for any of us, but what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted in something, and that this thing, at whatever cost, must be attained.

My experiments proved that the radiation of uranium compounds ... is an atomic property of the element of uranium. Its intensity is proportional to the quantity of uranium contained in the compound, and depends neither on conditions of chemical combination, nor on external circumstances, such as light or temperature.... The radiation of thorium has an intensity of the same order as that of uranium, and is, as in the case of uranium, an atomic property of the element.It was necessary at this point to find a new term to define this new property of matter manifested by the elements of uranium and thorium. I proposed the word radioactivity which has since become generally adopted; the radioactive elements have been called radio elements.

— Marie Curie

In Pierre Curie, with the Autobiographical Notes of Marie Curie, trans. Charlotte and Vernon Kellogg (1923), 96. Also in reprint (2012) 45-46.

Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.

— Marie Curie

Primary source uncertain. Found widely quoted as two sentences, without citation. For example, in Larry Chang, Wisdom for the Soul (2006), 304. If you have a primary source, please contact Webmaster, who has not yet found it in any large collection or biography, but has seen it mentioned without citation in many books as far back as 1952. Webmaster doubts that the second sentence is by Curie. The quote appears in a 1968 publication as the conclusion of an article, and only the first sentence is given in quotes. The second sentence is outside the quotes. See Glenn T. Seaborg, 'Need We Fear Our Nuclear Future?', Bulletin of the Atomic Scientists (Jan 1968), 24, No. 1, 42. Seaborg's article title, on page 36, is followed by the first sentence only, in quotes, citing Maria Sklodowska-Curie. His article condenses the speech he gave before a symposium in celebration of the Maria Sklodowska-Curie Centenary held in Warsaw, Poland (19 Oct 1967). The first sentence, alone, appears in French as «On ne doit rien craindre dans la vie—il suffit de comprendre,» in Université Laval, Faculté de médecine, Société medicale des hôpitaux universitaires de Québec, Laval médical (1951), 16, 569. This French source gives as context Marie Curie's discovery that she had cancer. The second sentence does not easily share that context, so the Webmaster believes it is solely the words of Glenn T. Seaborg, belonging only as a concluding remark to his article.

Sometimes my courage fails me and I think I ought to stop working, live in the country and devote myself to gardening. But I am held by a thousand bonds, and I don't know when I shall be able to arrange things otherwise. Nor do I know whether, even by writing scientific books, I could live without the laboratory.

This means that we have here an entirely separate kind of chemistry for which the current tool we use is the electrometer, not the balance, and which we might well call the chemistry of the imponderable.

— Marie Curie

(11 Dec 1911) As quoted in Marie and Pierre Curie and the Discovery of Polonium and Radium, Nobel Lecture

We believe the substance we have extracted from pitch-blende contains a metal not yet observed, related to bismuth by its analytical properties. If the existence of this new metal is confirmed we propose to call it polonium, from the name of the original country of one of us.

We cannot hope to build a better world without improving the individual. Toward this end, each of us must work for his own highest development, accepting at the same time his share of responsibility in the general life of humanity—our particular duty being to aid those to whom we think we can be most useful.

We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it. It must be done for itself, for the beauty of science, and then there is always the chance that a scientific discovery may become like the radium a benefit for humanity.

— Marie Curie

Lecture at Vassar College, Poughkeepsie, New York (14 May 1921). In Cambridge Editorial Partnership, Speeches that Changed the World, 53.

When one studies strongly radioactive substances special precautions must be taken if one wishes to be able to take delicate measurements. The various objects used in a chemical laboratory and those used in a chemical laboratory, and those which serve for experiments in physics, become radioactive in a short time and act upon photographic plates through black paper. Dust, the air of the room, and one's clothes all become radioactive.

At my urgent request the Curie laboratory, in which radium was discovered a short time ago, was shown to me. The Curies themselves were away travelling. It was a cross between a stable and a potato-cellar, and, if I had not seen the worktable with the chemical apparatus, I would have thought it a practical joke. Wilhelm Ostwald on seeing the Curie's laboratory facilities.

It was my good fortune to be linked with Mme. Curie through twenty years of sublime and unclouded friendship. I came to admire her human grandeur to an ever growing degree. Her strength, her purity of will, her austerity toward herself, her objectivity, her incorruptible judgement— all these were of a kind seldom found joined in a single individual... The greatest scientific deed of her life—proving the existence of radioactive elements and isolating them—owes its accomplishment not merely to bold intuition but to a devotion and tenacity in execution under the most extreme hardships imaginable, such as the history of experimental science has not often witnessed.

I have to keep going, as there are always people on my track. I have to publish my present work as rapidly as possible in order to keep in the race. The best sprinters in this road of investigation are Becquerel and the Curies...

Pierre Curie, a brilliant scientist, happened to marry a still more brilliant one—Marie, the famous Madame Curie—and is the only great scientist in history who is consistently identified as the husband of someone else.

In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) -- Carl Sagan